As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE WOULD NOT START ON APU DUCT LOW 20 PSI NR 2 STARTED DID XBLEED. *S/D* PER HNL "CHECKED THE DUCT PRESSURE FLUCTUATES WITH NO LOAD. CLEANED SURGE VALVE FILTER, NO HELP. REPLACED SURGE CONTROL VALVE MR49532-222 (979806-12) WITH MR49532-231. ENGINE START GOOD 30 PLUS PSI ". NO SHOP FINDINGS ARE AVAILABLE ON OFF UNIT.